I don't think Mollema will get Trek any more GT wins than Andy. He's a wheel- follower. Andy at least attacks when he has the legs (which is admittedly less and less these days).
I've seen it said that Tinkoff thinks he's going for a 3 jersey teams next year. Certainly Sagan can nail the green on his own, but with him sprinting twice a day, that basically would have them a man down of 9 trying to fight for yellow, and forget about Majka going for polka dot and still hauling Contador to the finish line in the mountains.